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Tighten leak-test threshold to 10% to actually fail the bug · pythonnet/pythonnet@29b841f · GitHub
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Tighten leak-test threshold to 10% to actually fail the bug
The previous 90% threshold (0.9 MB/iter against a 1 MB allocation) documented the issue but did not reproduce it: master leaks ~600-765 KB/iter, which the 0.9 MB threshold accepts as passing. Drop the threshold to 10% (104 KB/iter). On the 2026-05-09 verification run with Python 3.14 GIL on linux-aarch64: Without fix (master): ~572-765 KB/iter (FAIL) With fix (this branch): ~-500 B/iter (PASS) Margin is roughly 6x in either direction across .NET 8 and .NET 10, so the threshold cleanly separates buggy from fixed states without being sensitive to GC noise.
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‎tests/test_method.py‎

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -983,9 +983,10 @@ def test_getting_generic_method_binding_does_not_leak_memory(memory_usage_tracki
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bytesAllocatedPerIteration = pow(2, 20) # 1MB
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bytesLeakedPerIteration = processBytesDelta / iterations
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# Allow 90% threshold - this shows the original issue is fixed, which leaks the full allocated bytes per iteration
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# Increased from 50% to ensure that it works on Windows with Python >3.13
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.9
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# Tight 10% threshold: with the fix the per-iteration leak is essentially
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# zero, while the bug retains the bulk of the 1 MB payload (~600 KB/iter
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# on 3.14 GIL). 100 KB/iter cleanly distinguishes the two states.
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.1
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assert bytesLeakedPerIteration < failThresholdBytesLeakedPerIteration
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@@ -1025,8 +1026,8 @@ def test_getting_overloaded_method_binding_does_not_leak_memory(memory_usage_tra
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bytesAllocatedPerIteration = pow(2, 20) # 1MB
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bytesLeakedPerIteration = processBytesDelta / iterations
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# Allow 90% threshold - this shows the original issue is fixed, which leaks the full allocated bytes per iteration
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.9
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# Tight 10% threshold; see test_getting_generic_method_binding_does_not_leak_memory.
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.1
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assert bytesLeakedPerIteration < failThresholdBytesLeakedPerIteration
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@@ -1068,8 +1069,8 @@ def test_getting_method_overloads_binding_does_not_leak_memory(memory_usage_trac
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bytesAllocatedPerIteration = pow(2, 20) # 1MB
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bytesLeakedPerIteration = processBytesDelta / iterations
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# Allow 90% threshold - this shows the original issue is fixed, which leaks the full allocated bytes per iteration
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.9
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# Tight 10% threshold; see test_getting_generic_method_binding_does_not_leak_memory.
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failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration * 0.1
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assert bytesLeakedPerIteration < failThresholdBytesLeakedPerIteration
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